A secure, cross-platform, temporary file library for Rust. In addition to creating temporary files, this library also allows users to securely open multiple independent references to the same temporary file (useful for consumer/producer patterns and surprisingly difficult to implement securely).

Documentation

Minimum required Rust version: 1.63.0

Add this to your Cargo.toml:

[dependencies]
tempfile = "3"

This crate supports all major operating systems:

• Linux
• Android
• MacOS
• Windows
• FreeBSD (likely other BSDs but we don't have CI for them)
• RedoxOS
• Wasm (build and link only, Wasm doesn't have a filesystem)
• WASI P1 & P2.

However:

• Android, RedoxOS, Wasm, and WASI targets all require the latest stable rust compiler.
• WASI P1/P2 does not define a default temporary directory. You'll need to explicitly call tempfile::env::override_temp_dir with a valid directory or temporary file creation will panic on this platform.
• WASI P1/P2 does not have file permissions.
• You may need to override the temporary directory in Android as well to point at your application's per-app cache directory.

use std::fs::File;
use std::io::{Write, Read, Seek, SeekFrom};

fn main() {
    // Write
    let mut tmpfile: File = tempfile::tempfile().unwrap();
    write!(tmpfile, "Hello World!").unwrap();

    // Seek to start
    tmpfile.seek(SeekFrom::Start(0)).unwrap();

    // Read
    let mut buf = String::new();
    tmpfile.read_to_string(&mut buf).unwrap();
    assert_eq!("Hello World!", buf);
}